/*

This file is part of Ext JS 4

Copyright (c) 2011 Sencha Inc

Contact:  http://www.sencha.com/contact

Commercial Usage
Licensees holding valid commercial licenses may use this file in accordance with the Commercial Software License Agreement provided with the Software or, alternatively, in accordance with the terms contained in a written agreement between you and Sencha.

If you are unsure which license is appropriate for your use, please contact the sales department at http://www.sencha.com/contact.

*/
/**
 * @class Ext.chart.Mask
 *
 * Defines a mask for a chart's series.
 * The 'chart' member must be set prior to rendering.
 *
 * A Mask can be used to select a certain region in a chart.
 * When enabled, the `select` event will be triggered when a
 * region is selected by the mask, allowing the user to perform
 * other tasks like zooming on that region, etc.
 *
 * In order to use the mask one has to set the Chart `mask` option to
 * `true`, `vertical` or `horizontal`. Then a possible configuration for the
 * listener could be:
 *
        items: {
            xtype: 'chart',
            animate: true,
            store: store1,
            mask: 'horizontal',
            listeners: {
                select: {
                    fn: function(me, selection) {
                        me.setZoom(selection);
                        me.mask.hide();
                    }
                }
            },

 * In this example we zoom the chart to that particular region. You can also get
 * a handle to a mask instance from the chart object. The `chart.mask` element is a
 * `Ext.Panel`.
 * 
 */
Ext.define('Ext.chart.Mask', {
    /**
     * Creates new Mask.
     * @param {Object} config (optional) Config object.
     */
    constructor: function(config) {
        var me = this;

        me.addEvents('select');

        if (config) {
            Ext.apply(me, config);
        }
        if (me.mask) {
            me.on('afterrender', function() {
                //create a mask layer component
                var comp = Ext.create('Ext.chart.MaskLayer', {
                    renderTo: me.el
                });
                comp.el.on({
                    'mousemove': function(e) {
                        me.onMouseMove(e);
                    },
                    'mouseup': function(e) {
                        me.resized(e);
                    }
                });
                //create a resize handler for the component
                var resizeHandler = Ext.create('Ext.resizer.Resizer', {
                    el: comp.el,
                    handles: 'all',
                    pinned: true
                });
                resizeHandler.on({
                    'resize': function(e) {
                        me.resized(e);    
                    }    
                });
                comp.initDraggable();
                me.maskType = me.mask;
                me.mask = comp;
                me.maskSprite = me.surface.add({
                    type: 'path',
                    path: ['M', 0, 0],
                    zIndex: 1001,
                    opacity: 0.7,
                    hidden: true,
                    stroke: '#444'
                });
            }, me, { single: true });
        }
    },
    
    resized: function(e) {
        var me = this,
            bbox = me.bbox || me.chartBBox,
            x = bbox.x,
            y = bbox.y,
            width = bbox.width,
            height = bbox.height,
            box = me.mask.getBox(true),
            max = Math.max,
            min = Math.min,
            staticX = box.x - x,
            staticY = box.y - y;
        
        staticX = max(staticX, x);
        staticY = max(staticY, y);
        staticX = min(staticX, width);
        staticY = min(staticY, height);
        box.x = staticX;
        box.y = staticY;
        me.fireEvent('select', me, box);
    },

    onMouseUp: function(e) {
        var me = this,
            bbox = me.bbox || me.chartBBox,
            sel = me.maskSelection;
        me.maskMouseDown = false;
        me.mouseDown = false;
        if (me.mouseMoved) {
            me.onMouseMove(e);
            me.mouseMoved = false;
            me.fireEvent('select', me, {
                x: sel.x - bbox.x,
                y: sel.y - bbox.y,
                width: sel.width,
                height: sel.height
            });
        }
    },

    onMouseDown: function(e) {
        var me = this;
        me.mouseDown = true;
        me.mouseMoved = false;
        me.maskMouseDown = {
            x: e.getPageX() - me.el.getX(),
            y: e.getPageY() - me.el.getY()
        };
    },

    onMouseMove: function(e) {
        var me = this,
            mask = me.maskType,
            bbox = me.bbox || me.chartBBox,
            x = bbox.x,
            y = bbox.y,
            math = Math,
            floor = math.floor,
            abs = math.abs,
            min = math.min,
            max = math.max,
            height = floor(y + bbox.height),
            width = floor(x + bbox.width),
            posX = e.getPageX(),
            posY = e.getPageY(),
            staticX = posX - me.el.getX(),
            staticY = posY - me.el.getY(),
            maskMouseDown = me.maskMouseDown,
            path;
        
        me.mouseMoved = me.mouseDown;
        staticX = max(staticX, x);
        staticY = max(staticY, y);
        staticX = min(staticX, width);
        staticY = min(staticY, height);
        if (maskMouseDown && me.mouseDown) {
            if (mask == 'horizontal') {
                staticY = y;
                maskMouseDown.y = height;
                posY = me.el.getY() + bbox.height + me.insetPadding;
            }
            else if (mask == 'vertical') {
                staticX = x;
                maskMouseDown.x = width;
            }
            width = maskMouseDown.x - staticX;
            height = maskMouseDown.y - staticY;
            path = ['M', staticX, staticY, 'l', width, 0, 0, height, -width, 0, 'z'];
            me.maskSelection = {
                x: width > 0 ? staticX : staticX + width,
                y: height > 0 ? staticY : staticY + height,
                width: abs(width),
                height: abs(height)
            };
            me.mask.updateBox({
                x: posX - abs(width),
                y: posY - abs(height),
                width: abs(width),
                height: abs(height)
            });
            me.mask.show();
            me.maskSprite.setAttributes({
                hidden: true    
            }, true);
        }
        else {
            if (mask == 'horizontal') {
                path = ['M', staticX, y, 'L', staticX, height];
            }
            else if (mask == 'vertical') {
                path = ['M', x, staticY, 'L', width, staticY];
            }
            else {
                path = ['M', staticX, y, 'L', staticX, height, 'M', x, staticY, 'L', width, staticY];
            }
            me.maskSprite.setAttributes({
                path: path,
                fill: me.maskMouseDown ? me.maskSprite.stroke : false,
                'stroke-width': mask === true ? 1 : 3,
                hidden: false
            }, true);
        }
    },

    onMouseLeave: function(e) {
        var me = this;
        me.mouseMoved = false;
        me.mouseDown = false;
        me.maskMouseDown = false;
        me.mask.hide();
        me.maskSprite.hide(true);
    }
});
    
